Right now with just safari and a few background things I'm hovering at 6gb in use, so you're not wrong about how much memory is being used. Regardless I don't think it's a problem for light users. A light user imo would be just browsing and email. 8GB will give you plenty of headroom in that case.

I'm going to keep an eye on ram usage for the next few days. I'm curious what it will look like on a more full workload because if things have been swapping out, I haven't noticed.